USPS packages are delivered by your regular letter carrier. If he has already delivered today, there will not be a later delivery.
The tracking system is not outdated and works fairly well with some glitches, just like UPS and FedEx.
The reason you are only seeing “electronic notice received” is that the package has not yet been delivered by the shipper to the Post Office.
Also you can see more information about USPS Delivery Time.
He has generated a shipping label on-line and that is all he has done so far. Amazon does not provide any tracking of their own, any tracking number they give you is the one they received from USPS.
Varries by the mail volume for that day. Mail will start delivery to P.O. Boxes at USPS stations usually around 8:30am
1. All domestic express mail will be delivered before 12pm. If not you can get your money back.
2. All international express mail will be delivered before 3pm
3. All domestic mail and packages will be delivered when the city carrier arrives at your street to deliver mail.
4. All mail and parcels should be delivered by 5pm.
Also you can use Priority Mail Delivery Map to track your post.